joel-greenblatt

To rank stocks using the Magic Formula investing method, you quantitatively screen equities by their Return on Capital (ROC) and Earnings Yield (EY), then select a diversified basket of 20–30 stocks for a 1-year rebalance cycle.

A dynamic margin of safety distinguishes cigar butt cheapness from quality and growth, ensuring intrinsic value may expand over time, improving safety as time passes rather than merely buying assets at a discount.

You evaluate special situations like spinoffs and merger arbitrage by applying an "easy game" corporate events lens to identify opportunities where market mispricing is more likely, mapping potential restructurings, liquidations, and stub stocks.

Yes, you can use this framework to build a 20-stock portfolio by systematically ranking candidates by ROC and earnings yield, translating margin-of-safety reasoning into disciplined portfolio construction decisions.

Limitations of using the Magic Formula for equity selection include its reliance on a rigid 1-year rebalance cycle, which requires disciplined execution to avoid emotion-driven decisions and may not capture rapid corporate event mispricings without a special situations overlay.